‘A red rag to a bull’ means :

AAn important issue

BBeyond description

CDifficult position

DA thing of provocation


D. A thing of provocation

Related Questions:

To be "in the red" means :

What does the idiom ‘chip off the old block' mean?

Riya is at .............. since the death of her husband.

It’s the early bird that catches the_____.

Meaning of the idiom "To show white feather"